KEEPING MANURE UNDER COVER. 



61 



they buy a ton of the same manure that has been kept under cover 

 until February, they get, nitrogen, 15 Ibs. ; soluble minerals, 43 

 Ibs. In April, they get, nitrogen, 23| Ibs. ; soluble minerals, 67$ 

 Ibs. In August, they get, nitrogen, 25 Ibs. ; soluble minerals, 61 

 Ibs. In November, when the manure is over one year old, they 

 get, in a ton, nitrogen, 30 Ibs. ; soluble minerals, 88 fr Ibs. 



When manure has not been exposed, it is clear that a purchaser 

 can afford to pay considerably more for a ton of rotted manure 

 than for a ton of freaa manure. But waiving this point for the 

 present, let us see hew the matter stands with the farmer who 

 makes and uses the manure. What does he gam by keeping and 

 fermenting the manure under cover ? 



The following table shows the weight and composition of tlie 

 entire heap of manure, kept under cover, at different times : 



TABLE SHOW1NO COMPOSITION O7 ENTIRE EXPERIMENTAL HEAP (NO. II.) FRESH 

 FARM-YARD MANURE, UNDER SHED. 



This is the table, as given by Dr. Yoelcker. For the sake of 

 comparison, we will figure out what the changes would be in a 

 heap of five tons (10,000 Ibs.) of manure, when fermented under 

 cover, precisely in the same way as we did with the heap fer- 

 mented in the open air, exposed to the rain. The following is the 

 table : 



